He doesn't know ---A what to do B how to do 选那个,为什么,理由

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He doesn't know ---A what to do B how to do 选那个,为什么,理由

He doesn't know ---A what to do B how to do 选那个,为什么,理由
He doesn't know ---A what to do B how to do 选那个,为什么,
理由

He doesn't know ---A what to do B how to do 选那个,为什么,理由
A
选B的话后面要加一个it.
因为do在此是及物动词,后面要接宾语,what是代词,可以作它的宾语,而how是副词,不能作do的宾语.所以正确答案是A
希望你采纳,祝你学习进步,(⊙o⊙) !呵呵

A
what可以做do的宾语,how不行

选A,用what代表的是宾语,用how的话需要一个宾语,应该是how to do it

A what to do
如果用how,应该how to do it